62 Prof. A. Macalister on the Anatomy of the Derriah. 



trices above brown, tinged with olive ; rectrices traversed by 

 numerous narrow bands of a darker shade of brown ; upper 

 part of breast white, changing to cinereous lower down ; each 

 feather with a black shaft ; remainder of lower surface fulvous 

 mixed with cinereous olive ; under tail-coverts cinereous olive. 



Lonrjitudo 



Rostr. a nar. Alae. Caudse. Tarsi. 



T.Jerdoni.. 0-31 2-36 2-88 0-88. " Khasia Hills." 



T.pileata.. 0-50 2-62 3-12 1-00. "Java." 



Described from specimens obtained in the Khasia Hills. 



This bird has hitherto been considered identical with the 

 Javan T. 2nleata, Horsf. A comparison I have recently been 

 enabled to make with authentic Javan examples has convinced 

 me of their specific distinctness. True T. pileata is a larger 

 bird ; in it the bill is much more powerful, its altitude being 

 quite double that of examples from the Khasia Hills ; the 

 crown of the head is bright ferruginous, not dark chestnut ; 

 the colour of the upper plumage, wings, and rectrices is con- 

 siderably paler ; that of the lower is pale tawny ; and the ashy 

 colour of the black-shafted breast-plumes is less intense. My 

 deeply lamented friend Dr. Jerdon fully concurred with me in 

 the propriety of separating the two species. 



In the ' Birds of India ' [l. c.) this species is said to extend 

 through the Malayan peninsula to Java ; but I believe that 

 it has never been found further south than Arakan. Neither 

 it nor the Javan species has been shown to occur in the 

 Malayan peninsula or in Sumatra. It seems to belong to 

 that category of Javan forms (such as Harpactes ore^kios^ 

 Crypsirrhina varians, Bhringa remifer^ &c.) which, while 

 absent from the intermediate regions of Sumatra and the Malay 

 peninsula, reappear further to the north in Burma, some pene- 

 trating as far as Nipaul. 



X. — Notes on the Anatomy of the Derriah (Cynocephalus 

 hamadryas). By Alexander Macalister, M.B., Pro- 

 fessor of Zoology, University of Dublin. 



The Dublin Zoological Gardens received from Viscount 

 Southwell two fine specimens of this curious animal, a male 

 and a female, both full-grown and in excellent condition. 

 After a residence of some months, the male sickened and died 

 suddenly, and was dissected carefully by Professor Haughton 

 and myself. 



